Hey there, Guardian.
With the Vanguard reunited, Zavala has prioritized re-establishing a network of patrol beacons to coordinate Guardian efforts across the system. He gave this task to Cayde-6, who would totally do it, except he has a bunch of other really important things going on. Vanguard things. So, you know. It falls to you.
Travel to the European Dead Zone and complete the "Importance of Networking" activity.